WO2020138962A1

WO2020138962A1 - Image display device

Info

Publication number: WO2020138962A1
Application number: PCT/KR2019/018484
Authority: WO
Inventors: 김도훈
Original assignee: 엘지전자 주식회사
Priority date: 2018-12-26
Filing date: 2019-12-26
Publication date: 2020-07-02
Also published as: US11451160B2; KR102638182B1; KR20200079981A; US20200212810A1

Abstract

The present invention relates to an image display device. An image display device according to an embodiment of the present invention comprises: a display; and a power supply unit for supplying a power source to the display. The power supply unit comprises a converter having at least one switching element and for outputting a DC power source by converting the level of an input power source on the basis of the switching operation of the switching element. The operation can be performed, in a distinguished manner, in a first mode, in which the switching element continuously switches, and in a second mode, in which the switching element continuously switches and then stops the switching, in accordance with the load of an output terminal of the converter. Accordingly, power consumption can be reduced when an image is displayed.

Description

Video display device

The present invention relates to an image display device, and more particularly, to an image display device capable of reducing power consumption when displaying an image.

The video display device is a device having a function for providing a video that can be viewed by a user. The user can watch various images through the image display device.

On the other hand, in the trend of the video display device going to the large screen, various measures are being taken to reduce power consumption.

An object of the present invention is to provide an image display device capable of reducing power consumption during image display.

Another object of the present invention is to provide an image display device capable of reducing power consumption according to a load on a converter output stage or an image displayed on a display during image display.

An image display device according to an embodiment of the present invention for achieving the above object includes a display and a power supply for supplying power to the display, and the power supply comprises at least one switching element, Based on the switching operation, and includes a converter that converts the level of the input power, and outputs a DC power, the first mode in which the switching element is continuously switched according to the load of the output terminal of the converter, and the switching element is continuously switched and then switched It can operate by dividing into a second mode to stop the.

Meanwhile, the power supply unit further includes a control unit that controls the converter, and the control unit includes a first mode in which the switching elements are continuously switched according to the load of the output terminal of the converter, and a switching element in which the switching elements are continuously switched to temporarily stop switching. It can be controlled to operate in two modes.

Meanwhile, the controller may control the first mode to be performed when the load of the output terminal of the converter is higher than or equal to the first level, and to perform the second mode when the load is less than the first level.

Meanwhile, in the second mode, the switching element may perform a switching operation during the first half period of the first half period and the second half period of the period of the input AC power supply, and temporarily stop switching for the second half period.

Meanwhile, in the first mode, the switching element may continuously perform the switching operation during the first half cycle and the second half cycle.

Meanwhile, the power supply unit further includes an input voltage detection unit that detects an input AC voltage of the input AC power, and the control unit may control the second mode to be performed when the input voltage is greater than or equal to a predetermined value.

Meanwhile, the power supply unit further includes a dc stage voltage detection unit that detects the voltage at the output stage of the converter, and the control unit controls the second mode to be performed when the voltage at the output stage of the converter is equal to or greater than the first set value. When the second set value is lower than the set value and is less than the first set value, the first mode may be controlled to be performed.

On the other hand, when the voltage of the output terminal of the converter is less than the second set value, the control unit may control to stop switching for a longer period of time than the period of the input AC power supply.

On the other hand, if the load level of the output terminal of the converter is less than or equal to the first reference value, the second mode is controlled to be performed. It can be controlled as much as possible.

On the other hand, when the load level of the output terminal of the converter is greater than or equal to the second reference value, the control unit may control the switching of the switching element to be continuously stopped for a period longer than the period of the input AC power.

Meanwhile, the control unit may control the second mode to be performed when the black area in the image displayed on the display is greater than or equal to a predetermined ratio.

Meanwhile, the control unit may control the second mode execution period to increase as the proportion of the black region increases.

Meanwhile, the control unit may control the first mode to be performed when the image displayed on the display is a still image, and control the second mode to be performed when the image displayed on the display is a video.

Meanwhile, the converter includes a first diode element and a first switching element connected in series with each other, a second diode element and a second switching element connected in parallel with the first diode element and the first switching element, and connected in series with each other. Can.

Meanwhile, the converter is disposed between a first node between the first diode element and the first switching element and an input terminal, and a second inductor between the second diode element and the second switching element and an input terminal. A second inductor may be further included.

On the other hand, the image display device according to another embodiment of the present invention, a display having an organic light emitting panel, and a power supply for supplying power to the display, the power supply comprises at least one switching element, switching A first mode in which the switching element is continuously switched according to the image displayed on the display, and the switching element is continuously switched according to the image displayed on the display, by converting the level of the input power, based on the switching operation of the element Then, it can operate by dividing into a second mode to stop switching.

An image display device according to an embodiment of the present invention includes a display and a power supply for supplying power to the display, and the power supply comprises at least one switching element, based on a switching operation of the switching element, It includes a converter that converts the level of the input power and outputs a DC power, and the first mode in which the switching element is continuously switched according to the load of the output terminal of the converter, and the second mode in which the switching element is continuously switched and then stops switching It can be operated separately. Accordingly, power consumption can be reduced when displaying an image. In particular, according to the second mode, since switching is performed less than in the first mode, switching loss can be reduced, and accordingly, power consumption can be reduced.

Meanwhile, the power supply unit further includes a control unit that controls the converter, and the control unit includes a first mode in which the switching elements are continuously switched according to the load of the output terminal of the converter, and a switching element in which the switching elements are continuously switched to temporarily stop switching. It can be controlled to operate in two modes. Accordingly, it is possible to reduce power consumption when displaying an image according to the load of the output terminal of the converter.

Meanwhile, the controller may control the first mode to be performed when the load of the output terminal of the converter is higher than or equal to the first level, and to perform the second mode when the load is less than the first level. In particular, when the load is less than the first level, since switching is performed by the second mode, switching loss can be reduced, and therefore, power consumption can be reduced.

Meanwhile, in the second mode, the switching element may perform a switching operation during the first half period of the first half period and the second half period of the period of the input AC power supply, and temporarily stop switching for the second half period. In particular, since switching is paused during the second half cycle, power consumption can be reduced.

Meanwhile, the power supply unit further includes an input voltage detection unit that detects an input AC voltage of the input AC power, and the control unit may control the second mode to be performed when the input voltage is greater than or equal to a predetermined value. Accordingly, since the second mode is performed while the input voltage is stable, power consumption can be reduced.

Meanwhile, the power supply unit further includes a dc stage voltage detection unit that detects the voltage at the output stage of the converter, and the control unit controls the second mode to be performed when the voltage at the output stage of the converter is equal to or greater than the first set value. When the second set value is lower than the set value and is less than the first set value, the first mode may be controlled to be performed. Therefore, it is possible to reduce power consumption.

On the other hand, when the voltage of the output terminal of the converter is less than the second set value, the control unit may control to stop switching for a longer period of time than the period of the input AC power supply. Accordingly, the power consumption can be reduced, and the circuit element can be reported.

On the other hand, if the load level of the output terminal of the converter is less than or equal to the first reference value, the second mode is controlled to be performed. It can be controlled as much as possible. Therefore, it is possible to reduce power consumption.

On the other hand, when the load level of the output terminal of the converter is greater than or equal to the second reference value, the control unit may control the switching of the switching element to be continuously stopped for a period longer than the period of the input AC power. Accordingly, the power consumption can be reduced, and the circuit element can be reported.

Meanwhile, the control unit may control the second mode to be performed when the black area in the image displayed on the display is greater than or equal to a predetermined ratio. Accordingly, power consumption can be reduced according to an image.

Meanwhile, the control unit may control the second mode execution period to increase as the proportion of the black region increases. Accordingly, power consumption can be efficiently reduced by making the power consumption variable according to the image.

Meanwhile, the control unit may control the first mode to be performed when the image displayed on the display is a still image, and control the second mode to be performed when the image displayed on the display is a video. Accordingly, power consumption can be reduced according to an image.

On the other hand, the image display device according to another embodiment of the present invention, a display having an organic light emitting panel, and a power supply for supplying power to the display, the power supply comprises at least one switching element, switching A first mode in which the switching element is continuously switched according to the image displayed on the display, and the switching element is continuously switched according to the image displayed on the display, by converting the level of the input power, based on the switching operation of the element Then, it can operate by dividing into a second mode to stop switching. Accordingly, power consumption can be reduced according to an image. Accordingly, power consumption can be reduced when displaying an image. In particular, according to the second mode, since switching is performed less than in the first mode, switching loss can be reduced, and accordingly, power consumption can be reduced.

1 is a view showing an image display device according to an embodiment of the present invention.

FIG. 2 is an example of an internal block diagram of the image display device of FIG. 1.

3 is an example of an internal block diagram of the control unit of FIG. 2.

FIG. 4A is a diagram illustrating a control method of the remote control device of FIG. 2.

4B is an internal block diagram of the remote control device of FIG. 2.

5 is an internal block diagram of the display of FIG. 2.

6A to 6B are views referred to for explanation of the organic light emitting panel of FIG. 5.

7 is a diagram illustrating a voltage supplied to a display when AC power is supplied to the power supply unit.

8 is an example of an internal block diagram of an image display device related to the present invention.

9 is an example of an internal circuit diagram of a power supply according to an embodiment of the present invention.

10 is a flowchart illustrating an operation method of a video display device according to an embodiment of the present invention.

11 to 13 are views referred to for explanation of the operation method of FIG. 10.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffixes "modules" and "parts" for components used in the following description are given simply by considering the ease of writing the present specification, and do not give meanings or roles that are particularly important in themselves. Therefore, the "module" and the "unit" may be used interchangeably.

Referring to the drawings, the image display device 100 may include a display 180.

Meanwhile, the display 180 may be implemented as any one of various panels. For example, the display 180 may be any one of a liquid crystal display panel (LCD panel), an organic light emitting panel (OLED panel), and an inorganic light emitting panel (LED panel).

Meanwhile, hereinafter, the display 180 will be mainly described as having an organic light emitting panel.

An image display device according to an embodiment of the present invention may include a display 180 having an organic light emitting panel 210.

While the display 180 is enlarged, as the display 180 becomes larger, power consumption consumed by the display 180 increases.

In the present invention, a method for reducing power consumption according to an image displayed on the display 180 or a load of an output terminal of a converter supplying power to the display 180 is proposed.

To this end, the image display apparatus 100 according to an embodiment of the present invention includes a display 180 and a power supply unit 190 that supplies power to the display 180, and the power supply unit 190 includes: It includes at least one switching element (Sa, Sb), based on the switching operation of the switching element (Sa, Sb), converts the level of the input power, and includes a converter 700 for outputting a DC power supply (Vdc) In accordance with the load 900 of the output terminal nc-nd of the converter 700, the first mode in which the switching elements Sa and Sb are continuously switched, and the switching elements Sa and Sb are continuously switched and then switched. It can operate by dividing into the second mode to stop. Accordingly, power consumption can be reduced when displaying an image. In particular, according to the second mode, since switching is performed less than in the first mode, switching loss can be reduced, and accordingly, power consumption can be reduced.

Meanwhile, the image display apparatus 100 according to another embodiment of the present invention includes a display 180 having an organic light emitting panel and a power supply unit 190 supplying power to the display 180, and the power supply unit The converter 190 includes at least one switching element (Sa, Sb), and converts the level of the input power source based on the switching operation of the switching element (Sa, Sb), and outputs a DC power supply (Vdc) A first mode in which the switching elements Sa and Sb are continuously switched according to the image displayed on the display 180 and includes the 700, and the switching elements Sa and Sb are continuously switched and then stop switching. It can be operated in two modes. Accordingly, power consumption can be reduced according to an image. Accordingly, power consumption can be reduced when displaying an image. In particular, according to the second mode, since switching is performed less than in the first mode, switching loss can be reduced, and accordingly, power consumption can be reduced.

Various operation methods of the above-described image display device 100 will be described in more detail with reference to FIG. 9 and below.

Meanwhile, the video display device 100 of FIG. 1 may be a TV, a monitor, a tablet PC, a mobile terminal, a vehicle display, or the like.

Referring to Figure 2, the video display device 100 according to an embodiment of the present invention, the broadcast receiving unit 105, the external device interface unit 130, the storage unit 140, the user input interface unit 150, It may include a sensor unit (not shown), the control unit 170, the display 180, and an audio output unit 185.

The broadcast reception unit 105 may include a tuner unit 110, a demodulation unit 120, a network interface unit 130, and an external device interface unit 135.

Meanwhile, unlike the drawing, the broadcast receiving unit 105 may include only the tuner unit 110, the demodulator unit 120, and the external device interface unit 135. That is, the network interface unit 130 may not be included.

The tuner 110 selects an RF broadcast signal corresponding to a channel selected by a user or all pre-stored channels from among radio frequency (RF) broadcast signals received through an antenna (not shown). In addition, the selected RF broadcast signal is converted into an intermediate frequency signal or a baseband video or audio signal.

For example, if the selected RF broadcast signal is a digital broadcast signal, it is converted to a digital IF signal (DIF), and if it is an analog broadcast signal, it is converted to an analog baseband video or audio signal (CVBS/SIF). That is, the tuner 110 may process a digital broadcast signal or an analog broadcast signal. The analog baseband video or audio signal (CVBS/SIF) output from the tuner 110 may be directly input to the controller 170.

On the other hand, the tuner unit 110 may be provided with a plurality of tuners in order to receive a broadcast signal of a plurality of channels. Alternatively, a single tuner that simultaneously receives broadcast signals of multiple channels is possible.

The demodulator 120 receives the digital IF signal DIF converted by the tuner 110 and performs a demodulation operation.

The demodulator 120 may output a stream signal TS after demodulation and channel decoding. In this case, the stream signal may be a video signal, an audio signal or a data signal multiplexed.

The stream signal output from the demodulator 120 may be input to the controller 170. After performing demultiplexing, video/audio signal processing, and the like, the controller 170 outputs an image to the display 180 and outputs an audio to the audio output unit 185.

The external device interface unit 130 may transmit or receive data with a connected external device (not shown), for example, the set-top box 50. To this end, the external device interface unit 130 may include an A/V input/output unit (not shown).

The external device interface unit 130 may be connected to an external device such as a DVD (Digital Versatile Disk), a Blu-ray, a game device, a camera, a camcorder, a computer (laptop), or a set-top box through wired/wireless communication. , It can also perform input/output operations with external devices.

The A/V input/output unit may receive video and audio signals from an external device. Meanwhile, the wireless communication unit (not shown) may perform short range wireless communication with other electronic devices.

Through such a wireless communication unit (not shown), the external device interface unit 130 may exchange data with an adjacent mobile terminal 600. Particularly, in the mirroring mode, the external device interface unit 130 may receive device information, application information being executed, and application images from the mobile terminal 600.

The network interface unit 135 provides an interface for connecting the video display device 100 to a wired/wireless network including an Internet network. For example, the network interface unit 135 may receive content or data provided by the Internet or a content provider or a network operator through a network.

Meanwhile, the network interface unit 135 may include a wireless communication unit (not shown).

The storage unit 140 may store programs for processing and controlling each signal in the control unit 170 and may store signal-processed video, audio, or data signals.

Also, the storage unit 140 may perform a function for temporarily storing an image, audio, or data signal input to the external device interface unit 130. In addition, the storage unit 140 may store information about a predetermined broadcast channel through a channel storage function such as a channel map.

Although the storage unit 140 of FIG. 2 illustrates an embodiment provided separately from the control unit 170, the scope of the present invention is not limited thereto. The storage unit 140 may be included in the control unit 170.

The user input interface unit 150 transmits a signal input by the user to the control unit 170 or a signal from the control unit 170 to the user.

For example, a user input signal such as power on/off, channel selection, screen setting, etc. is transmitted/received from the remote control device 200, or a local key (not shown) such as a power key, channel key, volume key, or set value. Transfer the user input signal input from the control unit 170, or transmit the user input signal input from the sensor unit (not shown) that senses the user's gesture to the control unit 170, or a signal from the control unit 170 It can be transmitted to a sensor unit (not shown).

The control unit 170, through the tuner unit 110 or the demodulator 120 or the network interface unit 135 or the external device interface unit 130, demultiplexes the input stream or processes demultiplexed signals , It can generate and output signals for video or audio output.

The image signal processed by the control unit 170 may be input to the display 180 and displayed as an image corresponding to the corresponding image signal. Also, the image signal processed by the control unit 170 may be input to the external output device through the external device interface unit 130.

The audio signal processed by the control unit 170 may be sound output to the audio output unit 185. Also, the audio signal processed by the control unit 170 may be input to the external output device through the external device interface unit 130.

Although not illustrated in FIG. 2, the control unit 170 may include a demultiplexing unit, an image processing unit, and the like. This will be described later with reference to FIG. 3.

In addition, the control unit 170 may control the overall operation in the image display device 100. For example, the control unit 170 may control the tuner 110 to control the user to select (Tuning) an RF broadcast corresponding to a channel selected by a user or a pre-stored channel.

In addition, the control unit 170 may control the image display device 100 by a user command input through the user input interface unit 150 or an internal program.

Meanwhile, the control unit 170 may control the display 180 to display an image. At this time, the image displayed on the display 180 may be a still image or a video, and may be a 2D image or a 3D image.

Meanwhile, the control unit 170 may display a predetermined object in an image displayed on the display 180. For example, the object may be at least one of a connected web screen (newspaper, magazine, etc.), EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and text.

Meanwhile, the control unit 170 may recognize the user's location based on the image captured by the photographing unit (not shown). For example, a distance (z-axis coordinate) between the user and the image display device 100 may be grasped. In addition, the x-axis coordinates and the y-axis coordinates in the display 180 corresponding to the user's location can be grasped.

The display 180 converts a video signal, a data signal, an OSD signal, a control signal processed by the controller 170, or a video signal, data signal, or control signal received from the external device interface unit 130 to convert the driving signal. To create.

Meanwhile, the display 180 may be configured as a touch screen and used as an input device in addition to the output device.

The audio output unit 185 receives a signal processed by the control unit 170 and outputs it as voice.

The photographing unit (not shown) photographs the user. The photographing unit (not shown) may be implemented with one camera, but is not limited thereto, and may be implemented with a plurality of cameras. Image information photographed by the photographing unit (not shown) may be input to the controller 170.

The controller 170 may detect a user's gesture based on an image captured by the photographing unit (not shown) or each of the detected signals from the sensor unit (not illustrated) or a combination thereof.

The power supply unit 190 supplies corresponding power throughout the video display device 100. In particular, it is possible to supply power to a control unit 170 that can be implemented in the form of a system on chip (SOC), a display 180 for image display, and an audio output unit 185 for audio output. have.

Specifically, the power supply unit 190 may include a converter that converts AC power into DC power, and a dc/dc converter that converts the level of DC power.

The remote control device 200 transmits a user input to the user input interface unit 150. To this end, the remote control device 200 may use Bluetooth, radio frequency (RF) communication, infrared (IR) communication, ultra wideband (UWB), ZigBee, or the like. In addition, the remote control device 200 may receive an image, audio or data signal output from the user input interface unit 150, and display or output the sound from the remote control device 200.

Meanwhile, the above-described image display device 100 may be a digital broadcast receiver capable of receiving a fixed or mobile digital broadcast.

Meanwhile, the block diagram of the video display device 100 shown in FIG. 2 is a block diagram for an embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted depending on the specification of the image display device 100 that is actually implemented. That is, two or more components may be combined into one component, or one component may be divided into two or more components as necessary. In addition, the function performed in each block is for explaining an embodiment of the present invention, the specific operation or device does not limit the scope of the present invention.

3 is an example of an internal block diagram of the control unit of FIG. 2.

Referring to the drawings, the control unit 170 according to an embodiment of the present invention, the demultiplexing unit 310, the image processing unit 320, the processor 330, the OSD generation unit 340, the mixer 345 , A frame rate converter 350, and a formatter 360. In addition, an audio processing unit (not shown) and a data processing unit (not shown) may be further included.

The demultiplexing unit 310 demultiplexes the input stream. For example, when MPEG-2 TS is input, it can be demultiplexed to separate video, audio, and data signals. Here, the stream signal input to the demultiplexer 310 may be a stream signal output from the tuner 110 or demodulator 120 or the external device interface 130.

The image processing unit 320 may perform image processing of the demultiplexed image signal. To this end, the image processing unit 320 may include an image decoder 325 and a scaler 335.

The video decoder 325 decodes the demultiplexed video signal, and the scaler 335 performs scaling so that the resolution of the decoded video signal can be output from the display 180.

The video decoder 325 may be provided with decoders of various standards. For example, an MPEG-2, H,264 decoder, a 3D image decoder for color and depth images, and a decoder for multi-view images may be provided.

The processor 330 may control the overall operation in the image display device 100 or in the control unit 170. For example, the processor 330 may control the tuner 110 so as to select (Tuning) an RF broadcast corresponding to a channel selected by a user or a pre-stored channel.

In addition, the processor 330 may control the video display device 100 by a user command input through the user input interface unit 150 or an internal program.

In addition, the processor 330 may perform data transmission control with the network interface unit 135 or the external device interface unit 130.

Also, the processor 330 may control operations such as the demultiplexing unit 310, the image processing unit 320, and the OSD generating unit 340 in the control unit 170.

The OSD generator 340 generates an OSD signal according to a user input or by itself. For example, based on a user input signal, a signal for displaying various information on a screen of the display 180 in a graphic or text may be generated. The generated OSD signal may include various data such as a user interface screen of the video display device 100, various menu screens, widgets, and icons. In addition, the generated OSD signal may include a 2D object or a 3D object.

In addition, the OSD generating unit 340 may generate a pointer, which can be displayed on the display, based on a pointing signal input from the remote control device 200. In particular, such a pointer may be generated by the pointing signal processor, and the OSD generator 240 may include such a pointing signal processor (not shown). Of course, a pointing signal processing unit (not shown) may be provided separately without being provided in the OSD generating unit 240.

The mixer 345 may mix the OSD signal generated by the OSD generator 340 and the decoded video signal processed by the image processor 320. The mixed video signal is provided to the frame rate converter 350.

The frame rate converter (FRC) 350 may convert the frame rate of the input image. On the other hand, the frame rate conversion unit 350 can be output as it is without separate frame rate conversion.

On the other hand, the formatter (Formatter) 360, the format of the input video signal can be output by changing to a video signal for display on the display.

The formatter 360 may change the format of the video signal. For example, the format of the 3D video signal, side by side format, top down format, frame sequential format, interlaced format, checker box It can be changed to any one of various 3D formats such as format.

Meanwhile, the audio processing unit (not shown) in the control unit 170 may perform audio processing of the demultiplexed audio signal. To this end, the audio processing unit (not shown) may include various decoders.

Further, the audio processing unit (not shown) in the control unit 170 may process a base, treble, volume control, and the like.

The data processing unit (not shown) in the control unit 170 may perform data processing of the demultiplexed data signal. For example, if the demultiplexed data signal is an encoded data signal, it can be decoded. The coded data signal may be electronic program guide information including broadcast information such as start time and end time of a broadcast program broadcast on each channel.

On the other hand, the block diagram of the control unit 170 shown in Figure 3 is a block diagram for an embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted depending on the specification of the control unit 170 that is actually implemented.

In particular, the frame rate conversion unit 350 and the formatter 360 are not provided in the control unit 170, but may be separately provided or separately provided as one module.

As illustrated in (a) of FIG. 4A, it is illustrated that a pointer 205 corresponding to the remote control device 200 is displayed on the display 180.

The user can move or rotate the remote control device 200 up and down, left and right (FIG. 4A (b)), and front and rear (FIG. 4A (c)). The pointer 205 displayed on the display 180 of the image display device corresponds to the movement of the remote control device 200. The remote control device 200 may be referred to as a spatial remote controller or a 3D pointing device, as the corresponding pointer 205 is moved and displayed according to the movement on the 3D space, as shown in the figure.

4A (b) illustrates that when the user moves the remote control device 200 to the left, the pointer 205 displayed on the display 180 of the image display device moves to the left correspondingly.

Information on the movement of the remote control device 200 detected through the sensor of the remote control device 200 is transmitted to the video display device. The video display device may calculate the coordinates of the pointer 205 from information on the movement of the remote control device 200. The image display device may display the pointer 205 to correspond to the calculated coordinates.

FIG. 4A(c) illustrates a case in which a user moves the remote control device 200 away from the display 180 while a specific button in the remote control device 200 is pressed. As a result, the selected area in the display 180 corresponding to the pointer 205 may be zoomed in and displayed. Conversely, when the user moves the remote control device 200 to be closer to the display 180, the selected area in the display 180 corresponding to the pointer 205 may be zoomed out and reduced. On the other hand, when the remote control device 200 moves away from the display 180, the selected area is zoomed out, and when the remote control device 200 approaches the display 180, the selected area may be zoomed in.

Meanwhile, in a state in which a specific button in the remote control device 200 is pressed, recognition of up, down, left, and right movements may be excluded. That is, when the remote control device 200 moves to move away from or approach the display 180, the up, down, left, and right movements are not recognized, and only the forward and backward movements can be recognized. When a specific button in the remote control device 200 is not pressed, only the pointer 205 moves according to the up, down, left, and right movements of the remote control device 200.

Meanwhile, the moving speed or the moving direction of the pointer 205 may correspond to the moving speed or the moving direction of the remote control device 200.

4B is an internal block diagram of the remote control device of FIG. 2.

Referring to the drawings, the remote control device 200 includes a wireless communication unit 425, a user input unit 435, a sensor unit 440, an output unit 450, a power supply unit 460, a storage unit 470, Control unit 480 may be included.

The wireless communication unit 425 transmits and receives a signal to any one of the video display device according to the embodiments of the present invention described above. Among the video display devices according to the embodiments of the present invention, one video display device 100 will be described as an example.

In this embodiment, the remote control device 200 may include an RF module 421 capable of transmitting and receiving signals to and from the video display device 100 according to RF communication standards. Also, the remote control device 200 may include an IR module 423 capable of transmitting and receiving signals to and from the video display device 100 according to the IR communication standard.

In this embodiment, the remote control device 200 transmits a signal containing information about the movement of the remote control device 200 to the video display device 100 through the RF module 421.

Also, the remote control device 200 may receive a signal transmitted from the video display device 100 through the RF module 421. In addition, the remote control device 200 may transmit a command for power on/off, channel change, volume change, etc. to the video display device 100 through the IR module 423 as necessary.

The user input unit 435 may include a keypad, a button, a touch pad, or a touch screen. The user may input a command related to the image display device 100 to the remote control device 200 by operating the user input unit 435. When the user input unit 435 includes a hard key button, a user may input a command related to the image display device 100 to the remote control device 200 through a push operation of the hard key button. When the user input unit 435 includes a touch screen, the user may input a command related to the image display device 100 to the remote control device 200 by touching a soft key of the touch screen. In addition, the user input unit 435 may include various types of input means that can be operated by a user, such as a scroll key or a jog key, and this embodiment does not limit the scope of the present invention.

The sensor unit 440 may include a gyro sensor 441 or an acceleration sensor 443. The gyro sensor 441 may sense information on the movement of the remote control device 200.

For example, the gyro sensor 441 may sense information on the operation of the remote control device 200 based on the x, y, and z axes. The acceleration sensor 443 may sense information on the movement speed of the remote control device 200 and the like. Meanwhile, a distance measurement sensor may be further provided, thereby sensing a distance from the display 180.

The output unit 450 may output an image or audio signal corresponding to the operation of the user input unit 435 or a signal transmitted from the image display device 100. The user may recognize whether the user input unit 435 is operated or whether the image display device 100 is controlled through the output unit 450.

For example, the output unit 450 is an LED module 451 that lights up when the user input unit 435 is operated or a signal is transmitted and received through the wireless communication unit 425, a vibration module that generates vibration ( 453), an audio output module 455 for outputting sound, or a display module 457 for outputting an image.

The power supply unit 460 supplies power to the remote control device 200. The power supply unit 460 may reduce power waste by stopping power supply when the remote control device 200 has not moved for a predetermined time. The power supply unit 460 may resume power supply when a predetermined key provided in the remote control device 200 is operated.

The storage unit 470 may store various types of programs and application data required for control or operation of the remote control device 200. If the remote control device 200 transmits and receives signals wirelessly through the video display device 100 and the RF module 421, the remote control device 200 and the video display device 100 transmit signals through a predetermined frequency band. Send and receive. The control unit 480 of the remote control device 200 stores information on a frequency band capable of wirelessly transmitting and receiving signals to and from the video display device 100 paired with the remote control device 200 in the storage unit 470 and Can be referenced.

The control unit 480 controls all matters related to the control of the remote control device 200. The control unit 480 displays a signal corresponding to a predetermined key manipulation of the user input unit 435 or a signal corresponding to the movement of the remote control device 200 sensed by the sensor unit 440 through the wireless communication unit 425. (100).

The user input interface unit 150 of the video display device 100 includes a wireless communication unit 151 capable of transmitting and receiving signals wirelessly with the remote control device 200, and a pointer corresponding to the operation of the remote control device 200. A coordinate value calculating unit 415 capable of calculating a coordinate value of may be provided.

The user input interface unit 150 may transmit and receive signals wirelessly with the remote control device 200 through the RF module 412. In addition, through the IR module 413, the remote control device 200 may receive a signal transmitted according to the IR communication standard.

The coordinate value calculating unit 415 corrects a hand shake or an error from a signal corresponding to the operation of the remote control device 200 received through the wireless communication unit 151, and displays the coordinate value of the pointer 205 to be displayed on the display 170. (x,y) can be calculated.

The transmission signal of the remote control device 200 input to the video display device 100 through the user input interface unit 150 is transmitted to the control unit 180 of the video display device 100. The control unit 180 may determine information related to the operation and key operation of the remote control device 200 from the signal transmitted from the remote control device 200, and control the image display device 100 in response thereto.

As another example, the remote control device 200 may calculate a pointer coordinate value corresponding to the operation and output it to the user input interface unit 150 of the video display device 100. In this case, the user input interface unit 150 of the video display device 100 may transmit information regarding the received pointer coordinate values to the controller 180 without a separate hand shake or error correction process.

Also, as another example, the coordinate value calculating unit 415 may be provided inside the control unit 170 instead of the user input interface unit 150 unlike the drawing.

5 is an internal block diagram of the display of FIG. 2.

Referring to the drawings, the organic light emitting panel-based display 180 includes an organic light emitting panel 210, a first interface unit 230, a second interface unit 231, a timing controller 232, and a gate driver 234. , A data driver 236, a memory 240, a processor 270, a power supply 290, a current detector 1110, and the like.

The display 180 may receive the video signal Vd, the first DC power supply V1 and the second DC power supply V2, and display a predetermined video based on the video signal Vd.

Meanwhile, the first interface unit 230 in the display 180 may receive the image signal Vd and the first DC power supply V1 from the control unit 170.

Here, the first DC power supply V1 may be used for the operation of the power supply unit 290 in the display 180 and the timing controller 232.

Next, the second interface unit 231 may receive the second DC power supply V2 from the external power supply unit 190. Meanwhile, the second DC power supply V2 may be input to the data driver 236 in the display 180.

The timing controller 232 may output the data driving signal Sda and the gate driving signal Sga based on the image signal Vd.

For example, when the first interface unit 230 converts the input video signal Vd to output the converted video signal va1, the timing controller 232 is based on the converted video signal va1. Thus, the data driving signal Sda and the gate driving signal Sga can be output.

The timing controller 232 may further receive a control signal, a vertical synchronization signal Vsync, and the like, in addition to the video signal Vd from the controller 170.

In addition, the timing controller 232, in addition to the video signal Vd, a gate driving signal Sga and data for the operation of the gate driving unit 234 based on a control signal, a vertical synchronization signal Vsync, and the like. The data driving signal Sda for the operation of the driving unit 236 may be output.

Meanwhile, the timing controller 232 may further output a control signal Cs to the gate driver 234.

The gate driving unit 234 and the data driving unit 236 are through the gate line GL and the data line DL, respectively, according to the gate driving signal Sga and the data driving signal Sda from the timing controller 232. , The scan signal and the image signal are supplied to the organic light emitting panel 210. Accordingly, the organic light emitting panel 210 displays a predetermined image.

Meanwhile, the organic light emitting panel 210 may include an organic emission layer, and in order to display an image, a plurality of gate lines GL and data lines DL are formed in a matrix form in each pixel corresponding to the organic emission layer. It can be arranged crossing.

Meanwhile, the data driver 236 may output a data signal to the organic light emitting panel 210 based on the second DC power V2 from the second interface unit 231.

The power supply unit 290 may supply various power sources to the gate driving unit 234, the data driving unit 236, the timing controller 232 and the like.

The current detector 1110 may detect a current flowing through the subpixel of the organic light emitting panel 210. The detected current may be input to the processor 270 or the like to calculate the cumulative current.

The processor 270 may perform various types of control in the display 180. For example, the gate driver 234, the data driver 236, and the timing controller 232 may be controlled.

Meanwhile, the processor 270 may receive current information flowing through the sub-pixel of the organic light emitting panel 210 from the current detector 1110.

In addition, the processor 270 may calculate the cumulative current of the subpixels of each organic light emitting panel 210 based on the current information flowing through the subpixels of the organic light emitting panel 210. The calculated cumulative current may be stored in the memory 240.

On the other hand, the processor 270, if the cumulative current of the sub-pixel of each organic light-emitting panel 210 is more than the allowable value, it can be determined to burn (burn in).

For example, when the accumulated current of the sub-pixels of each organic light-emitting panel 210 is 300000 A or more, the processor 270 may determine that it is a burned-in sub-pixel.

On the other hand, when the accumulated current of some sub-pixels among the sub-pixels of each organic light-emitting panel 210 approaches the allowable value, the processor 270 may determine the sub-pixel as a sub-pixel for which burn-in is predicted.

Meanwhile, the processor 270 may determine a subpixel having the largest cumulative current as a burn-in prediction subpixel based on the current detected by the current detector 1110.

Meanwhile, the processor 270 calculates a burned subpixel or burned prediction subpixel in the organic light emitting panel 210 based on the current detected by the current detector 1110, and calculates the burned in subpixel or burned predicted subpixel It can be controlled to flow a current lower than the assigned current to the surrounding sub-pixel. Accordingly, burn-in of the sub-pixels around the burn-in sub-pixel may be extended. As a result, it is possible to extend the overall life of the image display device 100 having the organic light emitting panel 210.

Meanwhile, the processor 270 may control the calculated burn-in subpixel so that a current higher than the allocated current flows, and accordingly, a low current flows around the calculated burn-in subpixel, thereby reducing luminance. It can be prevented.

On the other hand, the processor 270, in the organic light emitting panel 210, when burn-in has not occurred, burn-in is predicted, by controlling the sub-pixel around the burn-in prediction sub-pixel to flow a current lower than the assigned current, burn-in The burn-in of the sub-pixels around the predicted sub-pixels can be extended. As a result, it is possible to extend the overall life of the image display device 100 having the organic light emitting panel 210.

Meanwhile, the processor 270 may control the calculated burn-in subpixel or the sub-pixels around the burn-in prediction subpixel so that a data voltage lower than the assigned data voltage is applied.

On the other hand, the processor 270, in the organic light emitting panel 210, when burn-in has not occurred, burn-in prediction, the burn-in prediction sub-pixel, by controlling the current to flow lower than the assigned current, the burn-in prediction of the sub-pixel The burn in can be extended. As a result, it is possible to extend the overall life of the image display device 100 having the organic light emitting panel 210.

Meanwhile, the processor 270 controls the current of the second level higher than the first level to flow into the second subpixel farther than the first subpixel among the calculated sub-pixels or sub-pixels around the burn-in prediction sub-pixel. It is possible to prevent the phenomenon that the luminance is lowered by allowing a higher current to flow through the second sub-pixel, which is expected to have a longer lifetime.

On the other hand, the processor 270, based on the current detected by the current detection unit 1110, calculates the sub-pixel of the largest accumulated current amount of the organic light emitting panel 210, sub-pixels around the sub-pixel of the largest accumulated current amount In, it can be controlled to flow a current lower than the assigned current. According to this, it is possible to extend the overall life of the image display device 100 having the organic light emitting panel 210.

Meanwhile, the processor 270 controls the organic light emitting panel 210 to control the flow of a lower level current to the subpixel having the largest accumulated current amount, the closer to the subpixel around the subpixel having the largest accumulated current amount. It is possible to extend the overall life of the image display device 100 having a.

First, FIG. 6A is a diagram showing pixels in the organic light emitting panel 210.

Referring to the drawings, the organic light emitting panel 210 includes a plurality of scan lines (Scan 1 to Scan n) and a plurality of data lines (R1, G1, B1, W1 to Rm, Gm, Bm, Wm) intersecting them. It may be provided.

Meanwhile, a subpixel is defined at an intersection region between the scan line and the data line in the organic light emitting panel 210. In the drawing, a pixel Pixel having subpixels SR1, SG1, SB1, and SW1 of RGBW is shown.

6B illustrates a circuit of any one sub pixel in a pixel of the organic light emitting panel of FIG. 6A.

Referring to the drawings, the organic light emitting sub-pixel circuit CRT is active, and may include a switching transistor SW1, a storage capacitor Cst, a driving transistor SW2, and an organic light emitting layer OLED. .

The switching transistor SW1 is connected to a gate terminal with a scan line, and turns on according to an input scan signal Vdscan. When turned on, the input data signal Vdata is transferred to the gate terminal of the driving transistor SW2 or one end of the storage capacitor Cst.

The storage capacitor Cst is formed between the gate terminal and the source terminal of the driving transistor SW2, and the data signal level transmitted to one end of the storage capacitor Cst and the DC power transferred to the other end of the storage capacitor Cst. (VDD) Stores a predetermined difference in level.

For example, when the data signals have different levels according to the PAM (Pluse Amplitude Modulation) method, the power level stored in the storage capacitor Cst varies according to the level difference of the data signal Vdata.

As another example, when the data signals have different pulse widths according to the PWM (Pluse Width Modulation) method, the power level stored in the storage capacitor Cst varies according to a difference in pulse width of the data signal Vdata.

The driving transistor SW2 is turned on according to the power level stored in the storage capacitor Cst. When the driving transistor SW2 is turned on, a driving current IOLED, which is proportional to the stored power level, flows in the organic light emitting layer OLED. Accordingly, the organic light emitting layer OLED performs a light emission operation.

The organic light emitting layer (OLED) includes a light emitting layer (EML) of RGBW corresponding to a subpixel, and at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL) It may include, in addition, may also include a hole blocking layer.

On the other hand, sub-pixels (sub pixell), all of the white light output from the organic light emitting layer (OLED), in the case of green, red, and blue sub-pixels, to implement the color, a separate color filter is provided. That is, in the case of green, red, and blue subpixels, green, red, and blue color filters are further provided, respectively. Meanwhile, in the case of a white sub-pixel, since white light is output, a separate color filter is unnecessary.

On the other hand, in the drawing, the switching transistor SW1 and the driving transistor SW2 are illustrated as p-type MOSFETs, but n-type MOSFETs or other switching devices such as JFETs, IGBTs, or SICs are used. It is also possible.

Meanwhile, the pixel is a hold type device that continuously emits light in the organic light emitting layer OLED after a scan signal is applied during a unit display period, specifically during a unit frame.

Meanwhile, as the current flows through the organic light emitting layer (OLED) disposed in each sub-pillar shown in FIG.

Referring to the drawing, when AC power is supplied to the power supply unit 190 at the time Ta, the operating power VDD is supplied to the panel 210 of the display 180 and turned on at a time Tb after the Px period.

Meanwhile, when the AC power supply is stopped at the time Tc, the voltage applied to the panel 210 falls to the ground voltage GND at the time Td.

Thereafter, when the AC power is supplied to the power supply unit 190 again at the time of Te, the voltage supplied to the panel 210 of the display 180 increases, and at the time of Tf, the panel 210 of the display 180 ) Is supplied with the operating power VDD and turned on.

At this time, the period from the Td time to the Tf time, or the time period from the Tc time to the Tf time is preferably equal to or longer than the minimum warm-up period for panel protection.

Referring to the drawings, the image display device 100 of FIG. 8 may include a power supply unit 190, a microcomputer 750, a relay 755, a timing controller 232, and a panel 210.

When the plug PLG is connected to the outlet, AC power Vac is supplied to the power supply 190, and when the plug PLG is removed from the outlet, AC to the power supply 190 Power is not supplied.

The power supply unit 190 includes an ac/dc converter 710 that converts AC power (Vac) to DC power, a first dc/dc converter (715) that converts a level of DC power, and a second dc/dc converter ( 720), when the power is off, a standby unit 725 for supplying standby power may be provided.

Meanwhile, when a power-on signal from the remote control device 200 is received, the relay 755 operates, and an operation signal RL may be input to the micom 750.

The microcomputer 750 operates by receiving the operating power V1 from the power supply 190 and outputs the power control signal VDD_CL to the power supply 190.

The power supply unit 190 outputs the operating power VDD to the timing controller 232 in response to the power control signal VDD_CL, and the timing controller 232 supplies the operating power VDD to the panel 210. Can print

Referring to the drawings, the power supply unit 190 according to an embodiment of the present invention converts the input AC power supply (Vac) 705 to a DC power supply (Vdc) and outputs the converter 700 and the converter 700 A control unit 910 for controlling may be provided.

The power supply unit 190 according to an embodiment of the present invention is connected to an input voltage detection unit (A) for detecting the input AC voltage (Vac) of the input AC power supply (Vac), and an output terminal (nc-nd) of the converter 700 It may further include a capacitor (Ca), a dc stage voltage detector (B) for detecting the voltage of the output terminal (nc-nd) of the converter 700, a current detector (C) for detecting the current flowing in the converter 700 have.

The input voltage detection unit A can detect the input voltage Vac input from the input AC power supply Vac. To this end, the input voltage detector A may include a resistance element, an amplifier, and the like. The detected input voltage Vac is a discrete signal in the form of a pulse, and may be input to the control unit 910.

The current detector C can detect the current Ipf flowing in the converter 700. To this end, as the current detector C, a current trnasformer (CT), a shunt resistor, or the like can be used. The detected current Ipf is a discrete signal in the form of a pulse and may be input to the control unit 910.

The dc stage voltage detector B may detect the dc stage voltage Vdc that is both ends (nc-nd stage) of the capacitor Ca. To this end, the dc stage voltage detector B may include a resistance element, an amplifier, and the like. The detected dc stage voltage Vdc may be input to the control unit 910 as a pulsed discrete signal.

The converter 700 is provided with at least one switching element (Sa,Sb), and converts the level of the input power source (Vac) based on the switching operation of the switching element (Sa,Sb), DC power supply (Vdc) Can output

For example, the converter 700 may include four switching elements in the form of a full bridge.

As another example, the converter 700 may include two switching elements in the form of a half bridge and two diode elements. In the figure, a half bridge form is illustrated.

Referring to the drawings, the converter 700 is connected in parallel with the first diode element Da and the first switching element Sa, and the first diode element Da and the first switching element Sa connected in series with each other. And may include a second diode element Db and a second switching element Sb connected in series with each other.

Meanwhile, the converter 700 includes a first inductor La disposed between a first node na between the first diode element Da and the first switching element Sa and an input terminal, and a second diode element ( A second inductor Lb disposed between the second node nb between the Db) and the second switching element Sb and the input terminal may be further included. The first inductor La and the second inductor Lb may be connected in parallel to each other.

The current detector C may detect a current flowing through the first inductor La or a current flowing through the second inductor Lb when detecting the current Ipf flowing through the converter 700.

Meanwhile, the converter 700 includes a diode element D1 disposed between the input AC power source 705 and the first inductor La, and a diode element disposed between the input AC power source 705 and the second inductor Lb. (D2) may be further provided. The diode element D1 and the diode element D2 may be connected in parallel to each other.

On the other hand, in order to reduce the power consumption in the power supply unit 190, the power supply unit 190, the switching element (Sa, Sb) is continuous, depending on the load 900 of the output terminal (nc-nd) of the converter 700 The first mode for switching and the second mode for stopping switching after the switching elements Sa and Sb are continuously switched may operate. Accordingly, power consumption can be reduced when displaying an image. In particular, according to the second mode, since switching is performed less than in the first mode, switching loss can be reduced, and accordingly, power consumption can be reduced.

Meanwhile, the control unit 910 includes a first mode in which the switching elements Sa and Sb continuously switch according to the load 900 of the output terminal nc-nd of the converter 700 and the switching elements Sa and Sb. It can be controlled to operate by dividing into a second mode in which switching is continuously switched and then pausing switching. Accordingly, according to the load 900 of the output terminal nc-nd of the converter 700, it is possible to reduce power consumption when displaying an image.

Meanwhile, when the load 900 of the output terminal nc-nd of the converter 700 is equal to or higher than the first level, the control unit 910 controls the first mode to be performed, and the load 900 is the first level. If less than, it can be controlled to perform the second mode. In particular, when the load 900 is less than the first level, since switching is performed by the second mode, switching loss can be reduced, and accordingly, power consumption can be reduced.

On the other hand, the switching elements (Sa, Sb), in the second mode, the first half cycle (Pca, Pcc, Pce,...) and the second half cycle (Pcb, Pcd,,) of the cycle of the input AC power supply (Vac). ..) during the first half cycle, the switching operation may be performed, and the switching may be paused during the second half cycle (Pcb, Pcd,,... ). In particular, since the switching is paused during the second half cycle (Pcb, Pcd,...), power consumption can be reduced.

Meanwhile, the power supply unit 190 further includes an input voltage detection unit A that detects an input AC voltage Vac, and the control unit 910 has a second mode when the input voltage Vac is greater than or equal to a predetermined value. It can be controlled to be performed. Accordingly, since the second mode is performed while the input voltage Vac is stable, power consumption can be reduced.

Meanwhile, the power supply unit 190 further includes a dc terminal voltage detection unit B for detecting the voltage of the output terminal nc-nd of the converter 700, and the control unit 910 includes an output terminal of the converter 700 ( When the voltage of nc-nd) is greater than or equal to the first set value Vre1, the second mode is controlled to be performed, and the second set value Vre2 is lower than the first set value Vre1 and less than the first set value Vre1. , It can be controlled to perform the first mode. Therefore, it is possible to reduce power consumption.

On the other hand, when the voltage of the output terminal nc-nd of the converter 700 is less than the second set value Vre2, the control unit 910 switches the switching elements Sa and Sb, of the input AC power source Vac. For a period longer than the cycle, it can be controlled to continue to stop. Accordingly, the power consumption can be reduced, and the circuit element can be reported.

Meanwhile, when the load 900 level of the output terminal nc-nd of the converter 700 is lower than or equal to the first reference value Lre1, the control unit 910 controls to perform the second mode, and the first reference value Lre1 ), and may be controlled to perform the first mode when the second reference value Vre2 is higher than the first reference value Lre1. Therefore, it is possible to reduce power consumption.

On the other hand, when the level of the load 900 of the output terminal nc-nd of the converter 700 is greater than or equal to the second reference value Lre2, the control unit 910 switches the switching elements Sa and Sb. For a period longer than the period of (Vac), it can be controlled to stop continuously. Accordingly, the power consumption can be reduced, and the circuit element can be reported.

Meanwhile, when the black area in the image displayed on the display 180 is greater than or equal to a predetermined ratio, the control unit 910 may control the second mode to be performed. Accordingly, power consumption can be reduced according to an image.

Meanwhile, the control unit 910 may control the second mode execution period to increase as the ratio of the black region increases. Accordingly, power consumption can be efficiently reduced by making the power consumption variable according to the image.

Meanwhile, the control unit 910 controls the first mode to be performed when the image displayed on the display 180 is a still image, and performs the second mode when the image displayed on the display 180 is a video. Can be controlled. Accordingly, power consumption can be reduced according to an image.

Meanwhile, according to another embodiment of the present invention, the power supply unit 190 includes a first mode in which the switching elements Sa and Sb continuously switch according to an image displayed on the display 180 and the switching element Sa, Sb) may be operated by dividing into a second mode in which switching is stopped after continuous switching. Accordingly, power consumption can be reduced according to an image. Accordingly, power consumption can be reduced when displaying an image. In particular, according to the second mode, since switching is performed less than in the first mode, switching loss can be reduced, and accordingly, power consumption can be reduced.

10 is a flowchart illustrating an operation method of an image display device according to an embodiment of the present invention, and FIGS. 11 to 13 are views referred to for explanation of the operation method of FIG. 10.

Referring to the drawings, the input voltage detection unit A in the power supply unit 190 detects the input voltage (S1010). In addition, the dc stage voltage detection unit B in the power supply unit 190 detects the dc stage voltage.

The control unit 910 determines whether the input voltage detected by the input voltage detection unit A is equal to or greater than a predetermined value.

Next, the controller 910 may calculate the load 900 based on the dc stage voltage detected by the dc stage voltage detector B while the input voltage Vac is greater than or equal to a predetermined value.

For example, when the detected dc terminal voltage, that is, the voltage Vdc of the output terminal nc-nd of the converter 700 is greater than or equal to the first set value Vre1, the control unit 910 loads at a low light load. If it is determined and the detected dc stage voltage is greater than or equal to the second set value Vre2 lower than the first set value Vre1 and less than the first set value Vre1, it can be determined as a heavy load with high load.

On the other hand, when the detected dc stage voltage, that is, the voltage Vdc of the output terminal nc-nd of the converter 700 is less than the second set value Vre2, it is determined that the load is considerably high and high load. can do.

Meanwhile, when the load 900 level of the output terminal nc-nd of the converter 700 is lower than or equal to the first reference value Lre1, the control unit 910 determines that the load is low and the first reference value Lre1. If it is greater than or equal to or less than the second reference value Vre2 higher than the first reference value Lre1, it can be determined that the load is high and heavy.

On the other hand, when the level of the load 900 of the output terminal nc-nd of the converter 700 is greater than or equal to the second reference value Lre2, the control unit 910 may determine that the load is a very high load.

Meanwhile, when the level of the load 900 is higher than or equal to the first level Lre1, that is, in the case of a heavy load, the control unit 910 controls to perform the first mode (S1030), and the level of the load 900 is If it is less than the first level Lre1, the second mode may be controlled to be performed.

Here, the first mode may indicate a mode in which the switching elements Sa and Sb are continuously switched, and the second mode may indicate a mode in which the switching elements Sa and Sb are continuously switched and then stop switching.

For more specific description of the first mode and the second mode, it will be described with reference to FIG. 11.

Fig. 11(a) illustrates the input AC voltage waveform Vaca.

11B illustrates the voltage waveform Vpa output from the converter 700 according to the first mode.

According to the first mode, during the first half period (Pca, Pcc, Pce,...) and the second half period (Pcb, Pcd,...) of the period of the input AC power supply Vac, switching is continuously performed. It can be done.

Specifically, during the first half cycle (Pca, Pcc, Pce,...) and the second half cycle (Pcb, Pcd,,...), the first and second switching elements (Sa, Sb) are turned on, You can repeat the turn off.

Accordingly, as shown in the drawing, a half-wave rectified voltage waveform Vpa may be output, and eventually, a voltage corresponding to the voltage waveform Vpa may be stored in the capacitor Ca.

Therefore, when the load 900 is a heavy load, since an appropriate voltage is supplied, it is possible to stably display an image on the display 180.

11C illustrates the voltage waveform Vpb output from the converter 700 according to the second mode.

According to the second mode, the first half cycle (PCa) of the first half cycle (Pca, Pcc, Pce,...) and the second half cycle (Pcb, Pcd,...) of the cycle of the input AC power supply Vac During the operation, a switching operation may be performed, and switching may be paused for a second half period (Pcb, Pcd,,...).

Specifically, during the first half cycle (Pca, Pcc, Pce,...), the first and second switching elements Sa and Sb continue to turn on and off, but the second half cycle (Pcb, Pcd) During the period of ,,... ), the first and second switching elements Sa and Sb may be continuously turned off.

In this way, a period in which the first and second switching elements Sa and Sb are temporarily turned off may be referred to as a burst period.

That is, in the second mode, unlike the first mode, a burst section in which switching of the first and second switching elements Sa and Sb is temporarily stopped may be arranged.

Accordingly, as shown in the drawing, a half-wave rectified voltage waveform Vpb can be output for each half-cycle, and eventually, a voltage corresponding to the voltage waveform Vpb can be stored in the capacitor Ca. In particular, compared to the first mode, a low level voltage may be stored in the capacitor Ca.

Therefore, when the load 900 is a light load lower than the heavy load, since a corresponding voltage is supplied, power consumption can be reduced while displaying the image on the display 180.

Meanwhile, as an example of the heavy load, a still image, an image including a lot of white areas, etc. may be exemplified, and as an example of a light load, a video, an image including a lot of black areas, etc. may be exemplified.

On the other hand, in FIG. 11(c), the first and second modes are divided by dividing the first half period and the second half period among one period of the input AC voltage, but the first mode and the second mode are performed. The periods are not necessarily the same.

For example, the control unit 910 may control the first mode execution period and the second mode execution period to vary depending on the load or the level of the dc stage voltage.

Specifically, when the ratio of the black image to the image to be displayed is 50%, 40% of one cycle of the power AC voltage performs the first mode, 60% performs the second mode, and then displays the black image on the image to be displayed. When the ratio of increases to 70%, 30% of one cycle of the input AC voltage may be controlled to perform the first mode and 70% to perform the second mode. Accordingly, it is possible to efficiently reduce power consumption.

That is, the control unit 910 includes a first mode in which the switching elements Sa and Sb continuously switch according to the load 900 of the output terminal nc-nd of the converter 700 and the switching elements Sa and Sb. It can be controlled to operate by dividing into a second mode in which switching is continuously switched and then pausing switching. Accordingly, according to the load 900 of the output terminal nc-nd of the converter 700, it is possible to reduce power consumption when displaying an image.

12A illustrates an image 1210 including a white region and an image 1215 including a black region.

As described above, the control unit 910 may control the first mode to be performed when the image 1210 including the white area is displayed on the display 180.

Accordingly, during the first half period (Pca, Pcc, Pce,...) and the second half period (Pcb, Pcd,,...) of the period of the input AC power supply Vac, switching can be continuously performed. have.

Next, the control unit 910 may control the second mode to be performed when the image 1215 including the black area is displayed on the display 180.

Accordingly, during the first half cycle (PCa) of the first half cycle (Pca, Pcc, Pce,...) and the second half cycle (Pcb, Pcd,,...) of the cycle of the input AC power supply (Vac), The operation may be performed and switching may be paused for a second half cycle (Pcb, Pcd,,...).

12B illustrates a still image 1220 and a video 1225.

As described above, the control unit 910 may control the first mode to be performed when the still image 1220 is displayed on the display 180.

Since the still image 1220 usually includes more white regions than black regions, it is preferable that the first mode is performed.

Next, the control unit 910 may control the second mode to be performed when the video 1225 is displayed on the display 180.

Since the video 1225 usually includes more white areas than the black areas, it is preferable that the second mode is performed.

13 is a view referred to for explanation of the first mode and the second mode.

Referring to the drawing, FIG. 13A illustrates an input AC voltage waveform Vacm.

As described above, the control unit 910 may determine whether the input voltage Vacm is equal to or greater than a predetermined value Vref. Then, when the input voltage Vacm is greater than or equal to the predetermined value Vref, the controller 910 may control the second mode to be performed.

For example, when the input voltage Vacm is less than a predetermined value, the level of the voltage output from the converter 700 may be lowered despite the operation of the converter 700. It is possible to stop and control the first mode to be performed.

13B illustrates the current waveform Ipfa flowing through the converter 700 according to the first mode or the second mode.

Referring to the drawings, the Pma period and the Pme period are, according to the first mode, the first half period (Pca, Pcc, Pce,...) and the second half period (Pcb, Pcd, of the period of the input AC power supply Vacm). During the period of ,... ), switching can be performed continuously.

On the other hand, the Pmb section, the Pmd section, according to the second mode, the first half period (Pca, Pcc, Pce,...) and the second half period (Pcb, Pcd,... . ), during the first half cycle (PCa), a switching operation may be performed, and switching may be temporarily stopped during the second half cycle (Pcb, Pcd,...).

Meanwhile, the Pmc section may stop switching continuously for a predetermined period of the input AC power supply Vacm according to the third mode.

Fig. 13C illustrates the load waveform Ldm.

Referring to the drawing, in the Pma section and the Pme section, the load 900 level of the output terminal nc-nd of the converter 700 is greater than the first reference value Lre1 and is higher than the first reference value Lre1. Corresponds to the case where the reference value Vre2 or less, Pmb section and Pmd section correspond to the case where the load 900 level of the output terminal nc-nd of the converter 700 is less than or equal to the first reference value Lre1, and the Pmc section Corresponds to a case where the load 900 level of the output terminal nc-nd of the converter 700 exceeds the first reference value Lre1.

The control unit 910 may control the first mode to be performed when the first reference value Lre1 is greater than or equal to or less than the second reference value Vre2 higher than the first reference value Lre1, that is, during the Pma period and the Pme period. have.

According to the first mode, switching is continuously performed during the first half period (Pca, Pcc, Pce,...) and the second half period (Pcb, Pcd,...) of the period of the input AC power supply (Vacm). It can be done.

Meanwhile, the control unit 910 may control the second mode to be performed when the load level is equal to or less than the first reference value Lre1, that is, during the Pmb interval and the Pmd interval.

According to the second mode, the first half cycle (PCa) of the first half cycle (Pca, Pcc, Pce,...) and the second half cycle (Pcb, Pcd,...) of the cycle of the input AC power supply (Vacm) During the operation, a switching operation may be performed, and switching may be paused for a second half period (Pcb, Pcd,,...).

Meanwhile, the control unit 910 may control the third mode to be performed when the load level exceeds the first reference value Lre1, that is, during the Pmc period.

According to the third mode, switching may be continuously stopped for a predetermined period of the input AC power supply Vacm. In particular, it can be controlled to continue to stop for a period longer than the period of the input AC power supply (Vacm).

As described above, by operating the switching operation of the switching elements in the converter 700 according to loads, it is possible to reduce power consumption and protect circuit elements.

13(d) illustrates the dc stage voltage waveform Vdm which is the output stage of the converter.

Referring to the drawing, in the Pma section and the Pme section, the voltage of the output terminal nc-nd of the converter 700 is greater than or equal to the second set value Vre2 lower than the first set value Vre1 and less than the first set value Vre1. The Pmb section and the Pmd section correspond to the case where the voltage of the output terminal nc-nd of the converter 700 is equal to or higher than the first set value Vre1, and the Pmc section is the output terminal of the converter 700 ( It corresponds to the case where the voltage of nc-nd) exceeds the first reference value Lre1.

When the voltage of the output terminal nc-nd of the converter 700 is greater than or equal to the second set value Vre2 lower than the first set value Vre1 and less than the first set value Vre1, that is, the controller 910 , During the Pme period, it is possible to control the first mode to be performed.

Meanwhile, the controller 910 may control the second mode to be performed when the voltage of the output terminal nc-nd of the converter 700 is greater than or equal to the first set value Vre1, that is, during the Pmb period and the Pmd period. have.

Meanwhile, the control unit 910 may control the voltage of the output terminal nc-nd of the converter 700 to be performed when the third mode is performed when the voltage is less than the second set value Vre2, that is, during the Pmc period.

On the other hand, the operation method of the video display device of the present invention can be implemented as a code that can be read by the processor on a recording medium readable by the processor provided in the video display device. The processor-readable recording medium includes all types of recording devices in which data that can be read by the processor are stored. Examples of the recording medium readable by the processor include a ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and also implemented in the form of a carrier wave such as transmission through the Internet. . In addition, the processor-readable recording medium may be distributed over a networked computer system so that the processor-readable code is stored and executed in a distributed manner.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

Claims

display;

Includes; a power supply for supplying power to the display;

The power supply unit,

It includes at least one switching element, a converter for converting the level of the input power supply, based on the switching operation of the switching element, to output a DC power supply; includes,

According to the load of the output terminal of the converter, the switching device is a first display mode, characterized in that the switching device operates continuously divided into a second mode to stop switching after switching.
According to claim 1,

The power supply unit,

It further includes a control unit for controlling the converter,

The control unit,

According to the load of the output terminal of the converter, the video display device characterized in that to control the operation to be divided into a first mode in which the switching element is continuously switched, and a second mode in which the switching element is continuously switched and then temporarily stops switching. .
According to claim 2,

The control unit,

When the load of the output terminal of the converter, the first level or more, the first mode is controlled to be performed, if the load is less than the first level, the second mode is performed to control the video display Device.
According to claim 1,

The switching element, in the second mode,

A video display device comprising performing a switching operation during a first half cycle of a first half cycle and a second half cycle of the input AC power cycle, and temporarily stopping switching during the second half cycle.
According to claim 4,

The switching element, in the first mode,

An image display device characterized in that the switching operation is continuously performed during the first half cycle and the second half cycle.
According to claim 2,

The power supply unit,

Further comprising; an input voltage detection unit for detecting the input AC voltage of the input AC power source,

The control unit,

When the input voltage is more than a predetermined value, the image display device characterized in that the control to perform the second mode.
According to claim 2,

The power supply unit,

It further includes a dc terminal voltage detection unit for detecting the voltage of the output terminal of the converter,

The control unit,

When the voltage of the output terminal of the converter is greater than or equal to the first set value, the second mode is controlled to be performed, and when the second set value is lower than the first set value and less than the first set value, the first mode is controlled to be performed. Video display device, characterized in that.
The method of claim 7,

The control unit,

When the voltage of the output terminal of the converter is less than the second set value, the switching of the switching element, for a period longer than the period of the input AC power supply, characterized in that the control to stop the video display.
According to claim 2,

The control unit,

When the load level of the output terminal of the converter is less than or equal to a first reference value, the second mode is controlled to be performed, and when the first reference value is greater than or equal to a second reference value higher than the first reference value, the first mode is performed. Video display device characterized in that the control as possible.
The method of claim 9,

The control unit,

When the load level of the output terminal of the converter is greater than or equal to the second reference value, the switching of the switching element is controlled to continue to be stopped for a period longer than the period of the input AC power.
According to claim 2,

The control unit,

When the black area in the image displayed on the display is greater than or equal to a predetermined ratio, the image display device is characterized in that the second mode is controlled to be performed.
The method of claim 11,

The control unit,

An image display apparatus characterized in that it controls to increase the duration of the second mode as the proportion of the black region increases.
According to claim 2,

The control unit,

When the image displayed on the display is a still image, the first mode is controlled to be performed, and when the image displayed on the display is a video, the second mode is controlled to be performed.
According to claim 1,

The converter,

A first diode element and a first switching element connected in series with each other;

And a second diode element and a second switching element connected in parallel with the first diode element and the first switching element, and connected in series with each other.
The method of claim 14,

The converter,

A first inductor disposed between a first node and an input terminal between the first diode element and the first switching element;

And a second inductor disposed between the second node and the input terminal between the second diode element and the second switching element.
A display having an organic light emitting panel;

Includes; a power supply for supplying power to the display;

The power supply unit,

It includes at least one switching element, a converter for converting the level of the input power supply, based on the switching operation of the switching element, to output a DC power supply; includes,

According to the image displayed on the display, the switching device is divided into a first mode for continuous switching, and a second mode for stopping switching after the switching device is continuously switching, and is operated.
The method of claim 16,

The power supply unit,

It further includes a control unit for controlling the converter,

The control unit,

According to the image displayed on the display, the display device characterized in that the switching device is operated to be divided into a first mode for continuous switching and a second mode for stopping switching after the switching device is continuously switched.
The method of claim 17,

The control unit,

When the black area in the image displayed on the display is greater than or equal to a predetermined ratio, the second mode is performed so that the image display device is controlled.
The method of claim 18,

The control unit,

The image display apparatus characterized in that the control is performed so that the duration of the second mode increases as the proportion of the black region increases.
The method of claim 17,

The control unit,

When the image displayed on the display is a still image, the first mode is controlled to be performed, and if the image displayed on the display is a video, the image display apparatus characterized in that the second mode is controlled to be performed.